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59 lines
2.2 KiB
YAML
59 lines
2.2 KiB
YAML
name: AWS SetDefaultPolicyVersion
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id: 2a9b80d3-6340-4345-11ad-212bf3d0dac4
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version: 1
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date: '2021-03-02'
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author: Bhavin Patel, Splunk
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type: batch
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datamodel: []
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description: This search looks for CloudTrail events where a user has set a default
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policy versions. Attackers have been know to use this technique for Privilege Escalation
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in case the previous versions of the policy had permissions to access more resources
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than the current version of the policy
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search: '`cloudtrail` eventName=SetDefaultPolicyVersion eventSource = iam.amazonaws.com
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| stats count min(_time) as firstTime max(_time) as lastTime values(requestParameters.policyArn)
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as policy_arn by src requestParameters.versionId eventName eventSource aws_account_id
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errorCode userAgent eventID awsRegion userIdentity.principalId user_arn | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)` | `aws_setdefaultpolicyversion_filter`'
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how_to_implement: You must install splunk AWS add on and Splunk App for AWS. This
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search works with cloudtrail logs.
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known_false_positives: While this search has no known false positives, it is possible
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that an AWS admin has legitimately set a default policy to allow a user to access
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all resources. That said, AWS strongly advises against granting full control to
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all AWS resources
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references:
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- https://labs.bishopfox.com/tech-blog/privilege-escalation-in-aws
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- https://rhinosecuritylabs.com/aws/aws-privilege-escalation-methods-mitigation-part-2/
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tags:
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analytic_story:
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- AWS IAM Privilege Escalation
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asset_type: AWS Account
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automated_detection_testing: passed
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cis20:
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- CIS 13
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1078/aws_setdefaultpolicyversion/aws_cloudtrail_events.json
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kill_chain_phases:
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- Actions on Objectives
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mitre_attack_id:
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- T1078.004
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nist:
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- PR.DS
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- PR.AC
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- DE.CM
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product:
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- Splunk Security Analytics for AWS
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- Splunk Enterprise
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- Splunk Enterprise Security
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- Splunk Cloud
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required_fields:
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- _time
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- eventName
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- userAgent
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- errorCode
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- requestParameters.userName
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- eventSource
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risk_object: src
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risk_object_type: system
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risk_score: 20
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security_domain: network
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